A5053895725- Cavitation Phenomena in Pumps
- Ship Hydrodynamics and Maneuverability
- Fluid Dynamics Simulations and Interactions
- Wind Energy Research and Development
- Carbon Dioxide Capture Technologies
- Spacecraft and Cryogenic Technologies
- Turbomachinery Performance and Optimization
- Structural Integrity and Reliability Analysis
- Hydraulic and Pneumatic Systems
- Particle Accelerators and Free-Electron Lasers
- Aerodynamics and Acoustics in Jet Flows
- Vibration and Dynamic Analysis
- Acoustic Wave Phenomena Research
- Risk and Safety Analysis
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Water Systems and Optimization
- Engineering Applied Research
- biodegradable polymer synthesis and properties
- Carbon dioxide utilization in catalysis
- Gas Dynamics and Kinetic Theory
- Petri Nets in System Modeling
- Constraint Satisfaction and Optimization
- Catalysts for Methane Reforming
- Radiative Heat Transfer Studies
The University of Texas at Austin
2018-2023
Pohang University of Science and Technology
2013-2018
Yonsei University
2011-2018
Pohang Accelerator Laboratory
2013
Lactide synthesis is an energy-intensive process used to produce polylactic acid (PLA). In this study, we propose a continuous lactide developed on the basis of recently one-step reaction using SnO2–SiO2 nanocomposite catalyst. This enables rapid time 40 ms for catalyst, which achieves 94% yield. To design efficient chemical process, kinetics were and heterogeneous reactor model was applied reactor. The proposed has advantages over commercial processes, having both rate high Moreover, its...
This study focuses on the techniques of improving refinery reliability, profitability, and availability. In this study, a corrosion control document (CCD) knowledge base system in crude oil distillation unit process is developed. CCD consists numerous parts namely damage mechanisms (DM), design data, critical reliability variables (CRV), guidelines, etc. To develop CCD, first off, material selection diagrams (MSD) drawn. The DM each effecting equipments that are based American Petroleum...
A low-order panel method is used to predict the performance of ducted propellers. full wake alignment (FWA) scheme, originally developed determine location force-free trailing open propellers, improved and extended wakes both propeller blades duct, including interaction with each other. The present applied on a sharp edge predicted results over wide range advance ratios, or without duct wake, are compared other, as well from RANS simulations measurements an experiment.
With an increased emphasis on reduced carbon emissions, many research efforts focused various capture techniques have concurrently expanded in application. Pressure swing adsorption (PSA) is one of the key processes for and storage (CCS). During natural gas sweetening operation PSA processes, a high volume dioxide included waste flow (heavy product). To improve CO2 purity flow, this work first performs dynamic optimization general four-step dual process. The objective rectifying unit to...
Reducing the on-board noise and fluctuating pressures on ship hull has been challenging represent added value research tasks in maritime industry. Among possible sources for unpalatable vibrations hull, propeller-induced have one of main causes due to inherent rotational motion propeller its proximity hull. In previous work, a boundary element method, which solves diffraction potentials propeller, used determine induced pressures. The flow around was evaluated via panel method time loading,...
Corrosion of devices and pipes in refinery petrochemical plants cause problems like deterioration process efficiency equipment reliability etc. Hence, a suitable technology is required to prevent accident caused by corrosion raise forecasting the degree corrosion. The on top distillation column are more serious due corrosive substances hydrogen sulfide chlorine Therefore, this study, rate was forecasted applied through analysis mechanism validity model checked using actual data.: considering...
In this article, we present a boundary element method (or panel method) applied to cavitating propeller investigate its performance with/without cavitation. The models both sheet cavitation and developed tip vortex concurrently so they can coexist in the flow induced by propeller. be either partial or supercavitation depending on imposed loading propeller, considers from blade determine sectional volume space time. Elaborate numerical schemes are introduced model cavities, it is shown that...
In order to predict ship hull pressure fluctuations induced by marine propellers, a combination of several numerical schemes is used. The propeller perturbation flow solved the boundary element method (BEM), while coupling between BEM solver and Reynolds-averaged Navier-Stokes (RANS) can efficiently effective wake. Based on solution under predicted wake, propeller-induced potential be evaluated. Then, pressure-BEM used solve diffraction in obtain solid factor which leads total pressure. This...
In this study, an interactive method coupling a boundary element (BEM) with viscous flow solver solving the Reynolds-averaged Navier–Stokes (RANS) equations is applied to multiturbine interaction problems. The BEMis first single turbine problem predict its performance with/without yaw in noncavitating/cavitating conditions. Improved wake alignment models, full and unsteady alignment, are used align blade wake. former adequate for steady state zero yaw, latter predictions case of nonzero...
A boundary element method (BEM) has been commonly used in a hydrofoil or propeller performance analysis. The effect of viscosity is often considered by applying constant empirical friction coefficient over the blade, which does not fully consider development layer. In this paper, three-dimensional (3D) low-order BEM coupled with an originally two-dimensional layer solver, X-foil, to evaluate on blade surface and predict open water characteristics 3D propeller. During process, equations are...
The magnets and vacuum chambers, which are the main facilities of Pohang light source installed on storage-ring girders. System safety reliability should be taken into account for precise operating facilities, so vibration analysis is essential to do this. Static seismic analyses were performed design structure considering safety, also frequency response spectrum alignment. With these results, effects surrounding checked. This paper explains about girder systems.
A comprehensive method which determines the most efficient propeller blade shapes for a given axisymmetric hull to travel at desired speed, is presented. nonlinear optimization used design blade, shape of defined by 3-D B-spline polygon, with coordinates control points being parameters be optimized maximum efficiency, effective wake and thrust. The performance within scheme assessed vortex-lattice (VLM). To account fully hull/propeller interaction, resistance are determined analyzing...
Abstract In this paper, a boundary element method (BEM) is applied to tip loaded propeller (TLP) predict its open water characteristics and induced hull pressures under fully-wetted uniform inflow. Tip of TLP blade has winglet-like plate on the pressure side improve overall efficiency over traditional propellers by preventing circulation loss toward region. TLPs are also used reduce vortex strength thus free from trade off against cavitation performance; therefore, predicting their...
본 연구를 통하여 화학 방사능 재난 발생 시 통합대응이 가능한 민방위담당관을 위한 새로운 프로그램 패키지를 개발하였다. 개발을 위하여 화학재난 대응시스템과 방사능재난 대응시스템을 통합하는 방향을 모색하였다. 이 프로그램은 625개의 및 시나리오를 탑재하고 있으며 이를 통해 재난에 대한 보다 체계적인 지역 공공보호 계획을 개선할 수 있을 것으로 기대된다. 또한, 실시간으로 정보를 공유함으로써 재난으로부터 발생할 있는 피해를 최소화 할 있다. A new prototype software package has been developed by integrating two existing programs designed to predict and maneuver chemical nuclear disasters in order set up a response system for dealing with the combined disasters. The protype is be mainly...
This paper presents a boundary element method applied to the numerical prediction of ducted turbine performance. The model is horizontal axis marine current subject uniform inflow. For this type steady problem, BEM runs much faster than finite-volume-method-based viscous simulation, thus facilitating analysis different configurations. primary purpose study investigate how duct shapes and loading conditions affect performance compared those from open turbines. Unlike lifting line model,...